Intercomparison of the gold, platinum, and MgO pressure scales up to 140 GPa and 2500 K

Y. Ye, V. Prakapenka, Y. Meng, Sang-Heon Shim

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    In order to intercalibrate the equations of state (EOSs) of the three widely used pressure standards, gold, platinum, and MgO, we have measured their unit cell volumes together in the laser-heated diamond anvil cell up to 140 GPa and 2500 K. At 300 K, three standards agree with each other within ±2.5 GPa to 135 GPa if the EOSs measured in quasi-hydrostatic media are used. We further refined the EOSs at 300 K, making them consistent with each other within ±1 GPa up to 135 GPa. At high temperature (T), the three standards match the best within ±1 GPa between 40 and 140 GPa, when we use the scales by Dorogokupets and Dewaele (2007). However, a 2–3 GPa discrepancy remains at 20–40 GPa and 1500–2000 K, with gold yielding the highest pressure (P). The pressure discrepancy is likely related to steep decreases in the Grüneisen parameter, the anharmonicity, and/or the electronic effects for the standards at the P-T conditions. Because gold melts near the temperatures expected for the mantle transition zone, severe anharmonic effects expected under premelting conditions make gold unsuitable for determining the phase boundaries in the region. The pressure scales by Dorogokupets and Dewaele (2007) provide tighter constrains on the Clapeyron slopes of the postspinel boundary to −2.0 to −2.7 MPa/K and the postperovskite boundary to 7–10 MPa/K. The data and refined EOSs presented here allow for reliable comparisons among experiments with different pressure standards for the entire P-T conditions expected for the Earth's lower mantle.

    Original languageEnglish (US)
    Pages (from-to)3450-3464
    Number of pages15
    JournalJournal of Geophysical Research: Solid Earth
    Volume122
    Issue number5
    DOIs
    StatePublished - May 1 2017

    Fingerprint

    platinum
    Platinum
    Gold
    gold
    Equations of state
    equation of state
    equations of state
    P-T conditions
    Earth mantle
    diamond anvil cell
    Diamond
    Phase boundaries
    lower mantle
    anvils
    hydrostatics
    cells
    transition zone
    electronics
    lasers
    temperature

    Keywords

    • equation of state
    • gold
    • mantle phase boundaries
    • periclase
    • platinum
    • pressure scale

    ASJC Scopus subject areas

    • Geophysics
    • Oceanography
    • Forestry
    • Ecology
    • Aquatic Science
    • Water Science and Technology
    • Soil Science
    • Geochemistry and Petrology
    • Earth-Surface Processes
    • Atmospheric Science
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science
    • Palaeontology

    Cite this

    Intercomparison of the gold, platinum, and MgO pressure scales up to 140 GPa and 2500 K. / Ye, Y.; Prakapenka, V.; Meng, Y.; Shim, Sang-Heon.

    In: Journal of Geophysical Research: Solid Earth, Vol. 122, No. 5, 01.05.2017, p. 3450-3464.

    Research output: Contribution to journalArticle

    @article{77abc22d6926413180d070b519beb18b,
    title = "Intercomparison of the gold, platinum, and MgO pressure scales up to 140 GPa and 2500 K",
    abstract = "In order to intercalibrate the equations of state (EOSs) of the three widely used pressure standards, gold, platinum, and MgO, we have measured their unit cell volumes together in the laser-heated diamond anvil cell up to 140 GPa and 2500 K. At 300 K, three standards agree with each other within ±2.5 GPa to 135 GPa if the EOSs measured in quasi-hydrostatic media are used. We further refined the EOSs at 300 K, making them consistent with each other within ±1 GPa up to 135 GPa. At high temperature (T), the three standards match the best within ±1 GPa between 40 and 140 GPa, when we use the scales by Dorogokupets and Dewaele (2007). However, a 2–3 GPa discrepancy remains at 20–40 GPa and 1500–2000 K, with gold yielding the highest pressure (P). The pressure discrepancy is likely related to steep decreases in the Gr{\"u}neisen parameter, the anharmonicity, and/or the electronic effects for the standards at the P-T conditions. Because gold melts near the temperatures expected for the mantle transition zone, severe anharmonic effects expected under premelting conditions make gold unsuitable for determining the phase boundaries in the region. The pressure scales by Dorogokupets and Dewaele (2007) provide tighter constrains on the Clapeyron slopes of the postspinel boundary to −2.0 to −2.7 MPa/K and the postperovskite boundary to 7–10 MPa/K. The data and refined EOSs presented here allow for reliable comparisons among experiments with different pressure standards for the entire P-T conditions expected for the Earth's lower mantle.",
    keywords = "equation of state, gold, mantle phase boundaries, periclase, platinum, pressure scale",
    author = "Y. Ye and V. Prakapenka and Y. Meng and Sang-Heon Shim",
    year = "2017",
    month = "5",
    day = "1",
    doi = "10.1002/2016JB013811",
    language = "English (US)",
    volume = "122",
    pages = "3450--3464",
    journal = "Journal of Geophysical Research: Solid Earth",
    issn = "2169-9097",
    publisher = "American Geophysical Union",
    number = "5",

    }

    TY - JOUR

    T1 - Intercomparison of the gold, platinum, and MgO pressure scales up to 140 GPa and 2500 K

    AU - Ye, Y.

    AU - Prakapenka, V.

    AU - Meng, Y.

    AU - Shim, Sang-Heon

    PY - 2017/5/1

    Y1 - 2017/5/1

    N2 - In order to intercalibrate the equations of state (EOSs) of the three widely used pressure standards, gold, platinum, and MgO, we have measured their unit cell volumes together in the laser-heated diamond anvil cell up to 140 GPa and 2500 K. At 300 K, three standards agree with each other within ±2.5 GPa to 135 GPa if the EOSs measured in quasi-hydrostatic media are used. We further refined the EOSs at 300 K, making them consistent with each other within ±1 GPa up to 135 GPa. At high temperature (T), the three standards match the best within ±1 GPa between 40 and 140 GPa, when we use the scales by Dorogokupets and Dewaele (2007). However, a 2–3 GPa discrepancy remains at 20–40 GPa and 1500–2000 K, with gold yielding the highest pressure (P). The pressure discrepancy is likely related to steep decreases in the Grüneisen parameter, the anharmonicity, and/or the electronic effects for the standards at the P-T conditions. Because gold melts near the temperatures expected for the mantle transition zone, severe anharmonic effects expected under premelting conditions make gold unsuitable for determining the phase boundaries in the region. The pressure scales by Dorogokupets and Dewaele (2007) provide tighter constrains on the Clapeyron slopes of the postspinel boundary to −2.0 to −2.7 MPa/K and the postperovskite boundary to 7–10 MPa/K. The data and refined EOSs presented here allow for reliable comparisons among experiments with different pressure standards for the entire P-T conditions expected for the Earth's lower mantle.

    AB - In order to intercalibrate the equations of state (EOSs) of the three widely used pressure standards, gold, platinum, and MgO, we have measured their unit cell volumes together in the laser-heated diamond anvil cell up to 140 GPa and 2500 K. At 300 K, three standards agree with each other within ±2.5 GPa to 135 GPa if the EOSs measured in quasi-hydrostatic media are used. We further refined the EOSs at 300 K, making them consistent with each other within ±1 GPa up to 135 GPa. At high temperature (T), the three standards match the best within ±1 GPa between 40 and 140 GPa, when we use the scales by Dorogokupets and Dewaele (2007). However, a 2–3 GPa discrepancy remains at 20–40 GPa and 1500–2000 K, with gold yielding the highest pressure (P). The pressure discrepancy is likely related to steep decreases in the Grüneisen parameter, the anharmonicity, and/or the electronic effects for the standards at the P-T conditions. Because gold melts near the temperatures expected for the mantle transition zone, severe anharmonic effects expected under premelting conditions make gold unsuitable for determining the phase boundaries in the region. The pressure scales by Dorogokupets and Dewaele (2007) provide tighter constrains on the Clapeyron slopes of the postspinel boundary to −2.0 to −2.7 MPa/K and the postperovskite boundary to 7–10 MPa/K. The data and refined EOSs presented here allow for reliable comparisons among experiments with different pressure standards for the entire P-T conditions expected for the Earth's lower mantle.

    KW - equation of state

    KW - gold

    KW - mantle phase boundaries

    KW - periclase

    KW - platinum

    KW - pressure scale

    UR - http://www.scopus.com/inward/record.url?scp=85018883614&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85018883614&partnerID=8YFLogxK

    U2 - 10.1002/2016JB013811

    DO - 10.1002/2016JB013811

    M3 - Article

    VL - 122

    SP - 3450

    EP - 3464

    JO - Journal of Geophysical Research: Solid Earth

    JF - Journal of Geophysical Research: Solid Earth

    SN - 2169-9097

    IS - 5

    ER -